ID:2379947
 
Resolved
Another problem with the dot-chain and conditional dot operators was revealed--actually an old problem that partially resurfaced. Projects that make use of these operators should recompile.
BYOND Version:512.1432
Operating System:Windows 8 Pro 64-bit
Web Browser:Chrome 67.0.3396.99
Applies to:Dream Maker
Status: Resolved (512.1433)

This issue has been resolved.
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I need you to edit the report to include your full version number, and also I'll need code to test since you say this doesn't happen in a clean environment. If you don't have publicly shareable code you can send me a .zip link on the pager.
BTW I think I have an idea of what's happening, but it's really important to get a case I can test.
That basically eliminates the possibility of a fix before Monday, then.
Even if you could shoot me a bigger snippet of the code that you know is misbehaving, that might be enough for me to work out a test case.
Lummox JR resolved issue with message:
Another problem with the dot-chain and conditional dot operators was revealed--actually an old problem that partially resurfaced. Projects that make use of these operators should recompile.