In addition to my menu bar not being transparent, I also have a sluggish Finder. When navigating in column view and pressing the right arrow key to go deeper into each directory, I get a very jerky horizontal scroll animation. This jerkiness also sometimes occurs in the dock, word of the day screensaver, and when opening a new Finder window.

USB-connected Nokia not recognized by Leopard
 

system log reports "CDC driver not found" when USB connection made in Default Mode (for iSync-ing).
This problem seems to be phone model-dependent.

Tiger OK ... Leopard no go.
Phone (Nokia 6136 and some other models reported on discussion forums) could be iSync'd in Tiger but not Leopard.

pdf documents not displaying correctly in preview
 

some pdf documents do not display correctly in preview 4.0, the text does not display at all or is garbled
the same pdf displays normally in acrobat
seems to be a bug in the new preview

Preference panel for MySQL is broken. Seems to have something to do with the fact that almost all users, including "mysql" have been renamed with a _ in front of the name. Not a big deal but it's worth noting.

Quicktime can't play in Firefox (nor safari) and causes instant crash
 

QuickTime not functioning in FireFox 2009 after upgrading to Leopard

and causes Firefox as well Safari to crash

QuickTime does functions in Microsoft Windows Explorer

I include the full FireFox crash log in http://www.psydj.tv/text/firefox_crash_log.rtf


below an excerpt due to macosxhints forum word amount limitations of the FireFox crash log

Process: firefox-bin [1702]
Path: /Applications/Fax modem Internet/Firefox.app/Contents/MacOS/firefox-bin
Identifier: org.mozilla.firefox
Version: 2.0.0.9 (2.0.0.9)
Code Type: X86 (Native)
Parent Process: launchd [174]

Date/Time: 2007-11-23 22:58:43.983 +0100
OS Version: Mac OS X 10.5.1 (9B18)
Report Version: 6

Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: 0x000000000000000a, 0x000000001430f06b
Crashed Thread: 0

Thread 0 Crashed:
0 ...ple.QuickTime Plugin.plugin 0x1430f06b NPP_New + 529
1 ...ple.QuickTime Plugin.plugin 0x142fef9d WebHelper_Private_New + 93
2 org.mozilla.firefox 0x00707200 ns4xPluginInstance::InitializePlugin(nsIPluginInstancePeer*) + 356
3 org.mozilla.firefox 0x001ed1f7 nsPluginHostImpl::~nsPluginHostImpl() + 783
4 org.mozilla.firefox 0x001e4558 nsActivePlugin::nsActivePlugin(nsPluginTag*, nsIPluginInstance*, char const*, int, nsIPluginInstancePeer*) + 404
5 org.mozilla.firefox 0x001ec236 nsPluginHostImpl::SetUpDefaultPluginInstance(char const*, nsIURI*, nsIPluginInstanceOwner*) + 2228
6 org.mozilla.firefox 0x00621a93 nsObjectFrame::InstantiatePlugin(nsPresContext*, nsHTMLReflowMetrics&, nsHTMLReflowState const&, nsIPluginHost*, char const*, nsIURI*) + 637
7 org.mozilla.firefox 0x006231a5 nsObjectFrame::CreateDefaultFrames(nsPresContext*, nsHTMLReflowMetrics&, nsHTMLReflowState const&) + 4041
8 org.mozilla.firefox 0x0076ea1c nsLineLayout::ReflowFrame(nsIFrame*, unsigned int&, nsHTMLReflowMetrics*, int&) + 810

etc

the FireFox 2009 crash log embedded in an html page http://www.psydj.tv/text/firefox_crash_log.html

!!!! Solved ONE Leopard related problem !! QuickTime can work in firefox
 

I solved the problem for Firefox !!!!!!!!

first what didnt solve the problem
but created the problem
a simple upgrade yo Leopard

than what didnt solve the problem even was making it worse
a clean install with archiving my old system
mac os 5 became very sluggish and hanging every so and so second

!!!!!!!!!!!!!!!!!!!!!!

than what did solve my problems (sofar) !!!!

I did a clean install with erasing disk from the leopard 5.0 install dvd

after having backed up my hard disk,
with the Bombich shareware carbon copy cloner 3.0.1
http://www.bombich.com/software/ccc.html

than when i was asked if i had anything to import from another mac or any hard drive
i did an import of all my apps and all of my settings

since than everything is working fine fast faster as ever b4

even in safari i can hear the music in the video's on http://www.eventnow.tv sadly only with a non moving still frame

so the safari story stays unresolved but for the rest it works fine with Firefox 2009