Domain details update. IMSCP 1.3.5

Hello,
I'm running i-mscp 1.3.5 on a debian jessie.
Now logging with a reseller account i'm not be able to change customer's disk space anymore. If I click on "edit domain", set a new number and press update my browser last indefinitely on "connecting" and nothing happens.
I haven't found any useful logs, can you explain me how to debug and/or resovle this situation?

thank you very much

Update of imscp needs a lot of test and time, in the mean time is any possibilities to grow the disk size assigned to the user manually without using the panel?

thank you very much