Are you logging onto the forum from mulitple computers? i.e. at work, or on your partner/siblings computer?
Mostly at home, the past few days when I have been having problems its been at home

Do you access the site via a bookmark, or are you typing in the address manually?
I type in "aus" then click on the website link in the drop down box
Do you use Firefox or Internet Explorer? If you tell me which, and what version you're using, I can offer some solutions that might help.
Internet Explorer 8
In your browser click the Help menu, followed by About Internet Explorer (or About Mozilla Firefox).
If you're a bit tech savvy, you can try some solutions yourself:
Clearing the cache
Delete your temp folder
Delete the cookie for Australian Rat Forum
If you have your browser set to remember your password, try clearing it, too.
I'll try this when I get home, I've logged on with another computer and all the posts have come up

So maybe it was a problem with my home computer

Hetty, the only reason I posted multiple times was to let you guys know how often it was happening for me so you could help (me) fix it, I got worried when I didnt recieve a reply for a few days thats all.