Thanks to all, solved the sluggish mouse phenomena.   BUT.....(drumroll)

Here's my newest challenge. I have my content arranged in multiple runtimes on a separate drive. I had no trouble mounting my old Poser 6 and Poser 7 runtimes, and accessing the content within them, but any of the other multple runtimes will mount but won't display the content icons. For example, I can mount my Toons Runtime, I can click on the Character library folder within that runtime, then click on the Favorite Toons folder within it, but then none of the content icons display in the library. For some reason PoserPro "finds" the old Poser 6 runtime on my C drive and my old Poser 7 runtime on my F drive but it cant "find" any of my other customized runtimes which are also right there on my F drive. 

This is all new in Poser Pro never had this happen in any previous version of Poser and cant find anything in the documentation about what I'm doing wrong. Anyone else who's experienced this phenomena or knows how to resolve?