Unfortunately, Apple has completely dropped the support of our Performance Tool with the release of Logic 9.1 64-bit and there will be no further development for our legacy products from our side either.
All non-performance patches will play normally, though.
Also, please be aware of the fact, that some modes of the Performance Tool (i.e. Alternation and Repetition), although fully functional, can currently still not really be edited since Logic Pro 8 - this is beyond our influence!
Basically, the problem affects the visual feedback of the Tools interface, which makes it impossible to edit its settings.
So if you launch Logic 9 in 32-bit(!), loading and playing previously saved or default EXS patches should actually work as before, only editing the Performance Tool is affected.
And especially as far as the Legato mode of the Performance Tool is concerned, everything in fact works as expected in Logic 9 32-bit.
You can download the last version of the Performance Tool from https://vsl.co.at/en/68/427/157/164/58.htm
I can´t find any registration for our legacy products in your User Account though - which EXS 24 libraries have you registered with us?
Best, Marnix