When i try search movie on filmweb.pl i have this: http://wstaw.org/m/2013/06/22/plasma-desktopRT5035.png . Webpages with this circle dont work, this cirsle rotate alll time. Reproducible: Always
Created attachment 80696 [details] screenshot
Can confirm it with this specific page and a number of other pages. However it's not true in general, for all "webpages with this circle". Not sure if Rekonq is stricter in sticking to specifications or if something isn't supported at all. However I agree the frequent Ajax errors are quite a plague when using Rekonq over other browsers.
Development on Rekonq ceased four years ago, and it has been unmaintained since then. KDE recommends using Falkon instead.