permalinks and profile switcher problem: SOLVED

is it safe to  make on and off permalinks?
When I make permalinks off I can not switch to the other profiles of the same user even though I cleared the cache.
it doesnt seem like there is the needed parameter in the link.

When permalinks are on the profile switcher link is like
/page/account-profile-switcher?switch_to_profile=285&redirect_back=1

when permalinks are off
/page.php?i=account-profile-switcher  so some parameters are missing,
I couldnt find the links in navigation to correct.

LeonidS  what is your opinion?