I found a bug :
If at Create New Wallet there where to specify by Name of your wallet something from two words, or between words there will be some sign, for example a point, then there will be difficulties with such account. Therefore it isn't recommended to enter a name and a surname at creation, dividing a gap. Or a name and a surname, between them putting an end. It is better to specify in Name of your wallet only figures. For example 014578. Because if you will enter a name or a nickname in which there is a gap or my Mr.PortMan nickname (sometimes I put an end) is divided by a point, for example as, you will lose an account.
Now as soon as didn't try to rename two files with the .wlt expansions and (new) with the .abd expansion - that it is impossible. The account for some reason can't translate coins. Now the obligatory requirement to store both files with these expansions. If .abd is lost, or at creation in the column Name of your wallet to put something from two words, or between words there will be some sign, for example a point, or a gap, access to such account will be impossible then, or is possible, at different combinations of renaming of these two files with the .wlt and .abd expansions, but it won't allow to translate coins any more. There will be an error of type it is impossible to contact the wallet file or it is impossible to contact the address book file.
So be attentive, at an institution we specify in Name of your wallet only figure and any points and gaps. Coins are lost, it is a pity
Here such first bug found. I will look for further. And as coins those all are lost which to me sent before, it is possible to send still here to this new address (TABDE4-SOSLXV-BQW4CH-ZDKHNC-WG7V6C-GXV2X3-3OO3) which was already got correctly where only figures were specified in Name of your wallet.
Original here : https://bitcointalksearch.org/topic/m.10350739
If you find such things please log an issue on github https://github.com/NewEconomyMovement/NemCommunityClient/issues.