silverlight - signalr ie9 and silverlight5 not working properly -

i'm having problem 3 days , driving me crazy: have silverlight busyness application hosted on windows7 ultimate , iis 7.5, i'm accesing site using ie9, on computer works great, access site locally or computer in network , works perfectly. there other computer outside network, there app hosted on windows 7 ultimate enterprise , iis7.5, when try access site using ie9 first time logging signalr works great logout , logging again signalr stops working. difference in ie version, i'm using update version 9.0.7 , using 9.0.11. so, question is: there known problem signalr apps hosted in iis 7.5 , win7 enterprise , ultimate or when accessing site using ie 9.0.7 , ie9.0.11? i've had deal problem of not hosting site on iis root.

any appreciated

thanks

thanks gustavo, i've solved problem updating latest version of signalr, 1 had 1.0.1, have 1.2.1 , problem gone, working expected.