I'm having this problem too, in red letters.
Posted under General
Last time I checked hasn't it always been six tags at once? Or is that only for Privledged?
Yes, I can use at most six tags at once. (I double-checked the limit now, to see if any bug had messed with it.)
When I try to use seven, the error is "Error: You can only search up to six tags at once", like always.
But, when I search for green_hair * (or any tag and an asterisk), that weird error message about 7 tags appears.