I have several systems running QDX5.4 and AIX 5.3 in an HACMP configuration. I plan on upgarding the QDX5.3 on AIX 5.2 to also be on QDX5.4 and AIX 5.3. We had very few conversion issues. The most notable was the use of bulkcopy with old variants. We converted the ones having issues to use the pathcopy statements.
Also the tclprocs apparently we had a second occurence of a proc in a another tcl file. mktclindex blew up until we removed second occurence. This would not show all of the custom tcl procs until corrected.
I am converting some old Xlates to use lowercase only in the names. In 5.4 if you have mixed case names and all lowercase with same spelling, you have to type in the name otherwise the mouse click will bounce you to the first occurence in the list.
Minimal issues and will look at installing rev 1 shortly.