Please Report ManifoldLab BUGS HERE.

[ggaliens]

Laura ... I have also seen this happen if the program "INTERSECT" somehow get's hung during a fail.
Start TASKMGR (task manager) and look to see if intersect.exe is still running. There could be 1 or two hung copies. This is for sure a mode of failure that happens.

You can also link me to your model ... but I think it is just a cube inside a cude, right ? I tried that with latest MLAB and all was well.

What operating system are you running ?

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The program seems to behave as it only one instance can run at a time. So if there is a failed on sitting there blocking. That's a problem. That would not normally happen with just cube subtract cube test.

If you have SKYPE ... I'm willing to walk you through the problem with screen-sharing.