Well, rebooting seems to have sorted it. And I think I was getting All CPU Meter confused with Core Temp. In any event, I seemed to have two copies of CoreTemp installed into the gadget gallery, one of which seemed to be the 2.6 version... which should have been overwritten by the installing of the newer version, but wasn't. And somehow I had two copies of All CPU Meter running, but hadn't noticed because most of the gadgets I usually have Firefox sitting in front of. I now seem to be having the same issue with All CPU Meter in that I today wound up with two copies of THAT in the gadget gallery, after it told me there was a new version available... and I unwittingly installed 3.3 instead of 3.4, and then removed what I thought was 3.3 version... but now it's telling me again that there's a new version out there. Grrr....
Just tried to uninstall the one in there now, so I can REinstall the correct version and not have two indistinguishable copies showing, but the uninstaller is complaining it can't complete because the All CPU Meter 3.3 folder is being accessed by another program. Lemme try rebooting again... Oo
Okay, got that sorted out. When I'd gone to update to the newest version, the link to the first copy (which installs directly to the gadget handler) goes to a copy of version 3.3, the link to the second copy (which goes to a ZIPped file containing the installer) is of version 3.4, didn't look at the 3rd link. Not sure why I wound up with two copies in the gadget gallery, but I'm guessing it was because I installed an updated version during the same session I installed the previous version. It is also odd that the version I had running before wasn't showing there was a new version until I'd rebooted earlier to rule out there being two copies running.