I'm also having this issue. Just updated to 3.3.8 and I can no longer run anything from the editor. Tried completely uninstalling, removing all related files and registry setttings I could find, then reinstalling and I'm still having the same issue.
MsgBox(0, "Test", "Hello!")
Results in:
>C:program filesautoit3autoit3.exe "C:Users*****Desktopasdf.au3"
'C:program' is not recognized as an internal or external command,
operable program or batch file.
>Exit code: 1 Time: 0.230
Looks like a simple matter of missing quotation marks when it attempts to run the script, though I can't figure out how to fix it.
Also, dll functions like DllStructCreate() are no longer blue/italicized. Is this intentional?