well.. i stumbled over some more portable weirdness. i used the portable intall on a machine that has mc on it (i dont have one without). in the options i said that it should not use shell integration. this made me loose the shell integration from the mc on the machine.
i also tried to uninstall the portable install. i expect that that just works by deleting the map the install is made in. i was listening at the same time to some music played by the standard mc on the machine. when deleting the portable install i got the message that studio.dll could not be deleted. after closing the mc that was playing music, deleting worked.
after restarting the mc on the machine my track info viz was gone. just had to point to it to get it to work, but non the less.
this was all version 529
gab
btw. i never had the two versions open at the same time, as far as i remember. and the portable intall had never played a single file. playing now was still empty.