I didn't realise you could use adjective_is - I couldn't find it in autocomplete. I'll have a play with that later. Definitely sounds like the same issue though!
Viewing post in This code was working a few days ago...
Unfortunately beta 48 has thrown up another issue now that I'm trying to update the Spectrum version - when running the DAAD conversion, I'm getting a 'word already defined' error that was never a problem before. The instances of the word in question have not been changed between the two versions. It's still fine with beta 45d, but of course the adjective fix doesn't work there.
I've mailed you a resolution to this issue.
The quick answer is that there is now a conflict between a word you define to be an adjective and a word you define to be a noun, but Adventuron did not flag it ahead of time. In 45d, as there as no Adjectives being emitted, it was not a problem, in beta 48, it is a problem, but the workaround is to ensure that you don't use the same word (or same 5 letter stem of a word for both a noun and an adjective).
I'll work on getting Adventuron to flag this in the editor too, but the fix is rather easy, as documented more fully in the email.