500 blocks problem when syncing some wallets of altcoins. Help!!!

[A L I E N]

Help please!
Some wallets of altcoins dont want to sync at my windows. I try another computer - everything work correctly.

I open wallet and then 500 blocks downloading and stop. Stop for hours. Than I reopen wallet agains - and 500 blocks is downloading. And stop!
Last wallets that I tried is bitsend, CampusCoin.

I many days tried to solve this problem. The only text I found in internet is this:
"The 500 blocks thing is known, it happens on all coins its as the wallet writes back to the database."

But what this mean and how to solve my problem? Please help!