Andrea,
GG says to make sure to say "thank you!". You are able to find problems on Arch that he does not see on Fedora. So as you probably already noted from the GIT checkin, at least 4 valgrind errors your logs pointed to have now been fixed. This last valgrind log has no additional errors reported in it, so I guess that the mod for lv2 plugins fixed the "invalid read" error. Will let you know next time gg wants a general or specific valgrind - probably after he gets to phase 2 of audio which we are struggling with.
Also, glad you got gdb working as it will come in handy in the future should you get a crash. For some reason I had thought that some png's did work with vdpau hardware acceleration (never mind, it was vaapi where some png's and jpg's work per the release notes so I guess vdpau never did?) P.S. I do NOT want to see your rodents.png file !!