Is this B2 Tranny symptoms? or Trans-X?

[BIGRED]

Tranny was fine on Monday. Tuesday morning first would only creep into 2nd. 2nd, 3rd and 4th were fine. Any reasonable throttle caused a shudder. Wed 1st was even weaker, could only let idle until a fair speed and then shifted into 2nd. Thurs, 1st and 2nd both slipping, car not drivable.

I put Trans-X in it about 150 miles ago, to try and deal with a slow front seal leak.

OR

Might the Trans-X cleaned everything up "so good" that my filter is plugged?

Thanks for any help in advance.

Don