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.