sending image upload login requests!

I’m using the new wordpress 2.9.2 and had some problems .. was that when trying to upload an image or some other file did not upload it and even showed me the window to upload to the login page of wordpress ..

This only happens in firefox in Opera and Google Chrome, the internt explore this normal

The login window appears for each individual upload what I do. . Thus, for example, if I try to upload 15 images at once, I get 15 windows log-in in a row. If I log in to one of them, I get a message “Are you sure you want to do this?” When I click the “Please try again” link, I am taken back to the main page of media uploader .. where none of my files were sent.

PS: I recall that upon login, I clicked on the button
“Remember” and since then no longer be sending consigui

so this complicates my life, I tried everything I know, but I can not, someone knows something about this?

I’ve tested the codes of safe mode, since I put the flash version 9.0 and nothing,

Opera reinstalled firefox and nothing

note: in the other pc using firefox the site is normal!, how can I fix it seems that this problem is only at home, I see as a solution to format the pc if not resolved since my site is only about photos

I’m waiting for a help!