Yesterday I reported an issue surrounding upgrading from RC 25 to 28 on the issues tracker, and checking today if it has been addressed, I find that the report has disappeared. I find the error message a bit cryptic, as it doesn't really speak as to what the issue is and how it may be corrected.

I get this same error report everytime.

Hi,

You should have got a couple of email notifications, 1 it being marked duplicated, then a link to the duplicate issue.

It's not deleted, just closed, here's the link back:
0003009: Will not upgrade from RC 25 - screenshot included - Composr CMS feature tracker
And here's the link to the issue I marked it a duplicate of, with a resolution:
0002981: Allowed memory size - Composr CMS feature tracker

Sorry for the issue, this was a nasty bug.