Quicktime for Windows performance is somewhat different to the Macintosh. If you are playing movies on the PC, then it is a good idea when you branch from one screen to another and BOTH contain quicktime movies (but different actual footage) make sure they are in the same channel. It appears that if you branch to another screen, but QuickTime is still there, the movies leave chunks out. (This is NOT consistent, so difficulty is encountered in submitting a bug report.)
Another tip is to always stop your QuickTime movies on your current screen before actually making the branch:
on stopQT
repeat with count = 1 to 48
put the castNum of sprite count into spcheck
if spcheck > 0 then
if the casttype of cast spcheck = #digitalVideo then
set the movieRate of sprite count = 0
end if
end if
end repeat
end stopQT
This handler is used for us on all our quicktime programs, and it seems to be
working. BUT (there is always one), you will probably have to also do
STARTS on your movies. Use the above handler, but instead of
"movierate of sprite count = 0" set it to 1.