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solved my blank-page problem after installation.
I use WS-FTP as ftp program. problem appeared to be the chmod settings of the upload/cache/templates_c folders and the mainfile.php.
these folders and file need to have chmod 777 ; but when you only click read AND write in WS-FTP they only get chmod 766. So make sure that in WS-FTP you tick read, write, AND execute for the Owner, the Group and Other (all 9 ticked)
After doing that.........yep it worked !
hope this helped