Yes, as per release notes for Cisco Finesse 10.5 says, Release Notes for Cisco Finesse Release 10.5(1) - Release Notes for Cisco Finesse Release 10.5(1) [Cisco Finesse] - Cis…
It seems it supports only IE version 9.0 and 11.0.
I just learned today through CIsco PDI Help Desk that 10.5.(1)SU1 was released at the end of September and the release notes @ http://www.cisco.com/web/software/280840578/117186/UCCX_RN_10.5su1.pdf
NOTE: As of today, Nov 6th, 2014, 10.5(1)SU1 is not visible under "Latest" in Download Software for UCCX 10.5.1. You have to drill down into "All Releases" to find it.