Hello , I just purchased a license ACF PRO and after installation I have a problem with the backend.
It can be seen in print screen .
I do not know what the problem, in firebug don’t shows me any error.

i assume you use the newest ACF & WordPress Versions. true?
for me it looks like:
your template or an additional plugin or language make problems/conflict with ACF.
if possible => try with default template (and/or) with only ACF plugin active.
and post results.
if we could find out what cause the problem than we could try to fix it