Linksys Wireless Router :: E2500 Can't See Other Computers On Local Network

I have a E2500 connected to a cable modem as the base of my home network. Hard wire connected to the E2500 is an linksys 8 port hub and a couple of computers. The 8 port hub is connected to a couple of computers and a xbox. I have the hub as a distro point to cut down on wiring. Wirelessly connected to the E2500 are a variety of laptops, netbooks, ipods, an ipad, a playbook, an iphone, a android phone, a wireless printer and a Ps3. Most of the devices are just using the wifi for internet access. Most devices have been setup with their own ip addresses to avoid ip conflicts. The computers and laptops/netbooks are running either Windows XP, Windows 7 or Mepis Linux. Up until now everything was going as good as can be expected, all the computers could see each other and most could transfer files between each other except when Windows gets picky.In the last few days no computers can see each other. Windows or Linux.Everything can accsess the internet and wirelessly print still just can't see each other. I reset the E2500. I updated the firmware on the E2500. I installed the Cisco Connect software (just in case I was too stupid too setup a router). Still nothing. I can ping other machines from a command prompt in windows or a terminal in Linux and get a good ping back. In the router setup via a browser I can go to the status page and see other devices on the local network but most are just ipods, ipad, playbook and the wireless printer, If I go to the administration page / diagnostics I can ping other computers and get a good answer. I just can see them from each other. I think I've rebooted every thing at least once. Yes the workgroup names are all the same (workgroup) and yes file sharing is turned on on all computers.