dear all
i'm running on 1.6.0.6 with default_bootstrap since months and i notice that since few days it's impossible to create a new customer account from front office,
visitors get this

*TECHNICAL ERROR: unable to load form. Details: Error thrown: Text status: parsererror*

i tried things i read in this forum but nothing solved it :
disable ccc in js
empty cache...

i checked with firebug and i see this which seems to be weird

how could we explain such \ in the url, is it that which comes to an error or is it absolutely normal and i'd better search for other reasons ?

I did not make changes in my back office recently,

i only remember have made few changes for front translations directly from the backoffice (not in the files) and update some modules as proposed...

Many thanks by advance cause it's being complicated to make business if it's impossible to sign in