The specifics are as follows:
1. When opening Classic docs in Express, the fonts are incorrectly translated. I get the message that Express cannot find the fonts (though the fonts are there, as the Classic doc was created on the same computer.)
2. The dreaded beach ball of death is a constant feature for the least of actions, such as changing fonts, etc.
3. Footnotes show up in Helvetica, instead of the original serif type chosen.
At this point I have ceased searching for more problems, as these render working with Express unworkable.
This is all the more disappointing as the graphical interface is so superior to Classic, and tech support has been so accomodating, yet unable to correct these problems in successive updates.

Hardware: Mac G5 1.8 ghz, 768 mb memory, OS 10.3.9, Nisus 2.5