Hi Rami,
Hope you are doing good.
Just to rule out a browser /proxy issue it would be great if you could trigger an HTTPWATCH trace.
Download the httpwatch tool (free from www.httpwatch.com) and send across the trace of this issue. More information is available in: note 1558903 - How To Trace a Portal Scenario Using HttpWatch.
Thank you!
_____________
Kind Regards,
Hemanth
SAP AGS