OpenEuphoria

For a moment I thought it might be no longer working on Windows XP (ah, brings back memories), but it's fine here.

Three possible options, none of them particularly grand, sorry:
1) reinstall, and hope that magically fixes it

2) run procmon, see if you can spot anything amiss there (as in turn if off asap, then look for suspicious errors somewhere near the end, of a usually very long list)

3) install ollydbg and open it with that, see if that gives any clues...