Upgrading Drupal

I got a bunch of errors when upgrading to RC4. About 70 errors. The all have "user warning:" infront of them. I followed the upgrade instructions perfectly. The only problem that I can see is the site was under maintenance. Would this cause an issue?
This is a brand new site that I might just reinstall again clean.

Hi,

after i upgraded from rc3 to rc4, i can't activate the gallery module...i tried using newest 4.7 gallery module, and cvs module, won't work, both gallery and drupal is working fine independently and working before on rc3...

i get this error also, dunno if it's related: invalid argument supplied for foreach() in /../includes/form.inc on line 432.

also, the image block would show up on the right when i click on admin->modules, but anywhere else it'd disappear...and when i click on a photo, it goes to page not found....

Upgrading from rc3 to rc4 made all the ajax functionality go away. I used the jstools collapsibleblocks module, and I noticed it stopped working. So I uninstalled that in case it interfered with the new core. But I also see that I can't click and expand the menu headings on admin/settings or formatting options when submitting content (or other expandable headings). It's the same whichever theme I choose too. I use firefox 1.5 but it's the same in IE and Opera.

Upgraded from RC3 to RC4. Everything seems fine except when trying to submit a image (home > create content > submit image).

This is the error:
warning: Invalid argument supplied for foreach() in /home/ghangout/public_html/includes/form.inc on line 432

I'm unsure if this is because of RC4 or if it's the image module. How can I check?

OK i hope i can explain this.

I have several forums and until upgrading to 4.7 RC4 i could go into a forum, click post new forum topic and that message will get posted to the forum i was in.

Now however when i go into the forum and click post new forum topic it defaults (in the dropdown) to the first forum i created which is seriously going to cause some confusion to my members.

So is it a setting that has changed i need to address or is this a bug ?

I've just manually upgraded a site from 4.7RC3 to 4.7RC4 , and now when i go to www.mydomain.com , and login, it then displays the www.mydomain.com/node page... which in turn breaks my site Mission...

Any ideas on how to stop it doing this? I'd like it to simply do what it was doing with RC3, eg when I logged in while at www.mydomain.com, it stayed on that URL once logged in...