Known issue. That version of Mids has been taken back down until Steiner can correct that bug as well as a number of others that were discovered.
The new patch was broken. Stiener is aware and planning to look at it on Monday. He reset the download version to the old one, so re-installing should work.
I didn't have the new patch, so no promises though. >.>
Also and unrelated, there are some weird word choices in the forum word filter. 
"Mastermind Pets operate...differently, and aren't as easily fixed. Especially the Bruiser. I want to take him out behind the woodshed and pull an "old yeller" on him at times." - Castle
ok so i just downloaded the latest version of mids and every time i try and open a past build i get this message
"Unable to read data - unable to read beyond the end of stream"
anyone having the same problem and a solution? is it something as simple as un and re installing mids?
Positron's i13 letter: We are trying to make PvP more accessible to new players, while giving experienced PvP'ers the advantage that comes with formulating tactics around the new systems we're putting in place. PvP from now on will be on our priority list. If something isn't working out, we'll be in there tweaking it and making it work, for the entire future of the product, not just Issue 13.