Hi, few days ago I tried to install the MRP module and all of a sudden it tells me that I cannot install app for more than 3 users. Very strange since till now I could install apps with no problems (what users is talking about? I have 3 users created in this OpenERP installation)

I found out I can still install the modules manual. So I went to ´Installed Modules´, removed the filter ´installed´, found MRP module and install it, went to 'Apply Scheduled Updates' and 'Update' It tells me 'The selected modules have been updated / installed ! ' - Great! it refreshes the page and nothing happens! The module is marks as 'To be installed' and it stays like that forever. Restart the server didn't help. What do I do wrong? How can I install modules now?