Hey there again, sorry to be here once more but, I�ve fixed this particule related issue, and as I see there are more people with this (or similar problem), I�d like to explain what was my problem.
Finally, is not nothing related to graphic driver or construct, it was related to the browser, Google Chrome.
After checking what version I have, I realised that I have a version with the "dev-m" extension, wich I don�t know what is, but I suppose is related to a developer version or something like that.
I�ve unninstalled that version (Versi�n 25.0.1349.2 dev-m), gone to chrome�s webpage and downloaded the lastest version, and now, I�ve 23.0.1271.95 m (not dev-m, only m), in wich everything seems to works as supossed to for now.
My girlfriend installed Chrome on her user (but oriented for everyuser on the computer) some weeks ago, and wow, it seems like she�s got a secret developer life, jaja.
Sorry for this topic, it wasn�t related directly to construc and it�s last release.
Thanks for everything.