filipetorres
on your site, some javascript errors are rendered - check all the errors in console, mostly some javascript rendered before plupload renders some javascript error which then prevents from running the plupload mutliple upload function
Maybe you can try to reinstall Phoca Gallery to be sure, no file was corrupted while installing or no file is missing on your server (e.g. some javscript file is missing, which needs to be loaded, etc.) and this can be done for whole Joomla! as e.g. the plupload needs to load Joomla! Jquery library.
On your server, there is no memory for running Joomla! - but what exactly is the problem, really no idea, the memory problem is displayed somewhere in Joomla! libraries function, so I think, you need to ask your webhosting operator - if there is enough memory to run Joomla! or if e.g. on the server there is other problemmike

