I was not able to see your pic that well when I clicked on it mercurio, it was too small :P

Just a few things

1 - have you updated to the latest build? I believe it is version 38. If not then you may want to back up your config and try updating.

2 - perhaps isboxer files have become corrupted somehow and isboxer needs to be uninstalled/reinstalled. If so backup and try this.

3 - Not sure if you are using windows vista/7 and have UAC on, if so might have to run isboxer/innerspace as admin. To do this, close isboxer/innerspace and reopen them by right clicking on isboxer .EXE file and choosing "run as admin". Do the same for innerspace and see if that helps.

4 - Same as number 2 but the addon "Isboxer" could of become corrupt. Try backing up the folder and move or delete the folder in the "interface > addons" folder and install isboxer again.

5 - the best bet would be what lax suggested and post your config file. to do this easily, click "file > copy config to clipboard > tick hide account names > click ok"

go to the website http://pastebin.com and "right-click and paste in the big box". hit submit (you may have to enter in a securty captcha code given), wait till the page finishes loading and go to your browser's address bar and copy the link and post it here.