If GMail is filtering the attachments in addition to the body text, then it's not one of the filters... it's probably just about all of them causing the problem.

I will get rid of the filters and see if the problem goes away. If it does, that will be an indication that GMail is filtering the attachments.

I presently get one or two messages in Spam per day; but I see a lot of messages that my filters have kicked directly into Trash. Now they will end up in Spam where I'll have to deal with them. (I keep my Spam folder empty.)

I'll just have to see how it goes.

tanstaafl.