Why such recurrent problems at neobux?

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Previously I had also faced such problems on some occasions at neobux but what I faced yesterday at the said site was horrible in a word. In the usual course when I click on any ad at neobux, a horizontal column yellow in colour starts running along the bottom of the screen and when it completes traversing the whole width of the screen, a message is displayed stating that the click is validated and is replaced by a horizontal green column. Yesterday whenever I clicked on any ad at neobux, there was the usual appearance of the horizontal yellow column which traversed the bottom of the screen all along but after it crossed over the whole width of the screen, instead of the usual message of validation of the click, an error message was displayed and also instead of the usual green column, there was a red horizontal column. I tried all the ads and all had the same fate. Have you ever encountered with any such problem at neobux? Is it due to any fault with the site or is it due to any fault of my computer and/or of the internet connection? Can you suggest any remedy for it?