Parent VI won't let me run two VIs at the same time.

[KevinPn]

So I have one PC connected to a CompactRio 9030 and a cDAQ 9174. The Compactrio is running a NI 9503 to power a stepper motor and the cDAQ 9174 is running a NI 9237 to read a load cell.

I can get readings from the load cell, and can get the motor to run. However I use two different VIs that belong to their own LabVIEW projects to run each. The motor and load cell have their own VIs. I can only run one at a time, when I run one VI the other front panel is "frozen" and I can't interact with it. I wrote a program to attempt to run both VIs at the same time.  

I tried to follow this format

http://digital.ni.com/public.nsf/allkb/498AFF045628DFA9862571D10079672F

However the program doesn't work and throws an error. I'm pretty new to LabView and any help would be great. Thank you!

[altenbach · Accepted solution]

What are the window appearance settings. For example is one set to "modal"?

[KevinPn]

Yes I think one of the window setting is set to modal. Heres a screenshot of the settings.

[altenbach]

Why?

[dkfire]

More questions: 

What type of projects are these two vi in? 

Are one of them a Real-time vi, that is part of a RT project and located under the RT target in the project?

Show us your projects, and files. 

Are your question releated? 

https://forums.ni.com/t5/LabVIEW/Can-I-use-a-CompactRio-9030-with-a-NI-9503-while-using-a-cDAQ/m-p/3...

[KevinPn]

For some reason one of the VIs was set to modal. I changed it to default and it works now. Thank you!

[altenbach]

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@KevinPn wrote:

For some reason one of the VIs was set to modal. I changed it to default and it works now. Thank you!

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Makes sense. A modal window will plant itself frontmost and will not allow interactions with other windows until it's closed.