Error 302

[ET]

When I start GUIDE, I get:

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*** ERROR 302 *** [PLUS1_IDE] INTERNAL: UNEXPECTED EXCEPTION WITH MESSAGE: {Access violation at address 0435B11F in module 'GuiSupport.dll'. Read of address 00000000}
1. What is this?
2. How do I fix it?

[ET]

I'm now also getting this same (except for the memory location) message from the compiler window:

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*** ERROR 302 *** [PLUS1_IDE] INTERNAL: UNEXPECTED EXCEPTION WITH MESSAGE: {Access violation at address 0441CC43 in module 'GuiSupport.dll'. Read of address 00000000}It seems to happen after I lock my screen to go somewhere else in the shop, or help somebody for 5 minutes, then come back to keep working on my project.
After the compiler fails with this message the first time, if you try to compile a 2nd time or more, you get this new message:

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*** ERROR 302 *** [PLUS1_IDE] INTERNAL: UNEXPECTED EXCEPTION WITH MESSAGE: {No open project}
Sounds like whatever pointer exists for the active project gets set to null / zero at some point.

Luckily I can still save my project, and close / reopen it to compile...