Here we go again:

Tried the quick reply to this thread:
http://forum.lowcarber.org/showthread.php?t=483481

and got:
Invalid Thread specified. If you followed a valid link, please notify the webmaster

I didn't notify the webmaster as it seems to do no good

I tried again, this time with the "post reply" button and it worked.

Sometimes neither method works, today one out of two did.