Had a similar problem, I was unable to login to main at all despite my details being correct (I double checked and tried a few times) and while a password reset worked, this is the second time it was necessary. 1st time was the 28th october, but I dismissed it.
During the problem the Quantum site and the forum were giving me a 404 file not found error message which stopped after I cleared my browsing history of cookies/cache etc. Then I was unable to login to quantum (note: started quantum tonight, affect in any way?)
I used the "forgot login" for both accounts, then accessed them both fine. Inconvenience more than anything else, so long as everything still works, I'm a smiley happy bunny!

Like repli, I'd like to why/if it's going to be regular... Might make me grrr eventually lol