Conversion takes more than 7 hours?

Hi guys!
I'm currently unable to convert my Slides (normal ppt). First it worked but once I tried to update it stoped, also for every new attempt (e.g. http://www.slideshare.net/Helpedia/so...). My slides are now converting since 7 hours+ although some are only one word (for testing).

My fault, or did you crrently face any problems?

Thanks in advance!