You are either using Firefox or Chrome or Edge OR have not installed a supported 32bit JRE.
Firefox or Chrome or Edge no longer support plugins. Therefore, you cannot use them with Forms 11 or older. Upgrade to Forms 12 and consider using one of the newer launching methods like JWS (Java Web Start) or FSAL (Forms Standalone Launcher). More information (including downloads) about Forms 12 can be found on the Oracle web site.
Go to application server logs, also turn on the java console and check java log also on client machine where finds the blank page.
Re installing of java may fix the issue.
Thanks for your answers, i will verify if jre 32 bits is installed and i think the problem is which i work on win 10 no ? I'm on internship where they use forms 11G.
Do you think if i downgrade to Win 7 and therefore ie 6 it'can work (i run on ie11 and can't install a former version) ?
Vansul : i tried to reinstall java but the problem is always here...
Thanks all for your help, is's working when i installed JRE 32 bits (even if i don't understand i must have 32 and 64 bit maybe because forms need it ?)
Have a good day everybody