Another LabVIEW bug? Event Structure Pull-down List does not show up...

[X.]

Recently, I have noticed something odd with my LV 2011 project.

My main VI's diagram has several parallel While Loops, one of which is the UI, consisting of a multicase Event Stucture. Currently there is 50 cases in it, nothing exceptional. However, one of the case has 8 different events listed in it, so when I click on the pull-down list of cases, it tends to cover a significant chunk of my screen. Let me rephrase that: it will cover about half of my 2048x1152 pixels screen. (In fact, it appears that the pull-down list width is limited to 1280 pixels no matter what, so if you have cases extending past that, you are out of luck to see them all at one glance...)

Occasionally, I will click on the pull-down case list and...nothing happens! At best, I get the right shadow of the pull-down case list, but most of the time absolutely nothing. Clicking on the arrows to the left and right of list will step through the cases, but I cannot browse the full list. The reason why I mentioned the many events case is that IF I DELETE this case, the list footprint is smaller and the pull-down list resumes working properly. If I cancel the deletion, the pull-down list does not work anymore. Now the interesting thing, as I was trying to better characterize this behavior, is that if I switch my screen resolution to less than 1600x1000, the pull-down list is working. Including and above these display settings, it won't work (or only when it decides it's OK). So that might be a Windows display bug, I dunno...

If I quit LV and restart, then things go fine for a while. Actually, occasionally, things return to normal on their own. But overall that is starting to annoy the heck of me.

I was wondering whether I am the only one to have experience this or not. The simple LV 2011 VI I am attaching shows the problem (at least on my computer). Of course you need a screen that has at least a 1600x1000 resolution...

Disclaimer for Ravens Fan: I have tried the Ctrl-"Run Button" trick, but that does not do it.

[X.]

Actually the attached VI shows that it has been around at least since LV 2010.

[KHartley]

Thank you for bringing this to our attention. I will go ahead and try to reproduce this bug and update you and possibly R&D with any findings.

[X.]

Another symptom of this problem is that when Right-Clicking the pull-down list and selecting the "Show Case" sub-menu...nothing happens. And in fact, I cannot move up or down the pop-up menu at all and need to click oustide of it to regain control.

As a side note, although the "Rearrange Case" function is working (because it opens a fixed size window), it shows it limitations by not being resizable:

1) You cannot see the full list, only 9 cases (as in NINE).

2) In the "Complete selector string", if this string is longer than the FIXED SIZE string indicator (which it is in the last case of the example posted above), since you don't even have a scrollbar for this string, you have to force select part of the string to show the different part of the string (and hence the different events handled by this case).

It is as if the "rearrange case" VI was written way back then (my guess would be LV 5?). I am off to create another feature request  for this one.

[KHartley]

I do see the issue of not displaying the full case name when it has mutliple events in each case.

However I am unable to reproduce the issues of the case display not displaying in either 2010 sp1 or 2011. Could you post a video (host of your choice) showing the issue of the non-loading event structure pane? I tried both methods of playing with the drop down box as well as the show case function and both were working correctly.

Please see the attached photo to verify the case not displaying correctly for the multiple event case that you described for the first issue.

[X.]

Well, wad'yunno? I was trying to record a movie of the problem last week, but could not. I am not sure why this appears not to "work" anymore, but Microsoft released a bunch of updates to Win XP last week (which I installed), so that may have fixed the problem. I will certainly not complain about it. One down! Sorry about the possible headaches this may have caused...

[X.]

Aha! It's back! I used Jing to capture the behavior. The ~45 sec video is here.

I am using the VI I posted above for the demo.

I first show that clicking on the left and right arrows moves through the different events as expected. Then I click in the pull-down list... and nothing happens. I do it once more and repeat the whole sequence.

The only difference between the video and what I am experiencing is that in real life, as I said, I see the "shadow" line which would normally be on the right edge of the list. For some reason, the screen capture utility removes this.

The weird thing is that everything has been working well (as far as I can tell) during the past few days.

[X.]

It might be gone (I haven't seen the problem in a couple of days) after I updated my NVIDIA video drivers (they were something like 4-5 years old).

Sorry for all the thrills.

[X.]

This problem has come back and forth several time since the previous post, and I have experienced it on a totally different brand spanking new machine running Windos 7 64 bit, so it is a bit more general that it looks. Problem is, it is sort of unpredictable. Usually restarting LV will fix the problem though.

[NetoNI]

Hello 

Are you sure that in this new computer there are no possible updates that it could be missing?

Regards.

Ernesto.