In this case you were right, and that's what was happening. When it was re-enabled, the rarity wasn't set to 100%. Setting the value below 100% compounded the rarity and made it excessively rare. The rarity is inherently correct with everything at 100% (and all other forages are) based on the selection principles I explained in an earlier post.
Code:
[15:54] <Uthgaard> http://www.project1999.org/forums/showthread.php?t=59593&page=2
[15:54] <Uthgaard> when you enabled these on the forage table, whoever did this, you did set the chance to 100% right?
[17:09] * Amelinda is now known as Faillinda
[17:11] * Faillinda is now known as Amelinda
[18:40] <kanras> Nope
[19:22] <Uthgaard> That's what's wrong then. If you set it to 5% for example, that doesn't mean it will be foraged 5% of the time. all forages need to be 100%.