You are aware that IE11 support is limited and a specific version (and SP) of SAP NetWeaver is required? See this blog details.
Spinning wheels are usually because of Unified Rendering (UR) problems. Run report WDG_MAINTAIN_UR_MIMES and make sure the deployed and installed versions of the UR are the same. You could also see if there are any known issues with the SAP_BASIS version you are using, there are UR corrections available for most versions. What is your SAP_BASIS version, 731? What SP level?