Not sure if it is the same issue but I found Midori (ironically) froze on the Raspberry Pi site front page. Following some advice I set vm.min_free_kbytes =16384 in /etc/sysctl.conf and Midori no longer freezes.
I bought a similar 1080P HDMI Male to VGA Female converter and it works perfectly with my old Neovo LCD display. http://www.ebay.co.uk/itm/170850801393ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649#ht_3488wt_1163 I thought I would have to manually configure the PI's HDMI port but everything work...