[Fedora-Bangladesh] Please give me a solution

[digonto ahsan]

I am running Fedora 10 and noticed something pretty odd.When I go into Network Manager , and try to specify a static IP address, I've ran into a possible bug. Whatever value I add into Subnet Mask, will auto change into the value of Default Gateway Address after I shift focus from that page. (i.e. if I switch tabs from the General tab, and then click right back, my subnet value is replaced with the gateway address.)Even after I enter in my subnet, hit save, open the Edit button back up, the subnet mask has again taken the gateway address.
when i use fedora 7 i face no problem to configure network but now i cant configure for that problem. 
 
Please give me a solution.
digonto.
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