Hello basw and Boxcryptor team.
I can confirm this behavior with a shared BoxCryptor drive on the host (Windows 7 Pro 64-Bit) while using VirtualBox Windows 7 32-Bit (German).
But this ONLY occurs when using VirtualBox from Oracle.
I tested the integrated WinXp Mode (32-Bit Windows XP Pro guest system)for Win7 Pro and Ultimate Versions: no Problem!
VmWare Player (Windows 7 Pro 32-Bit): No Problem!
Access to other, non Boxcryptor folders works without this endless "counting".
It must be the method how VirtualBox accesses the share (it does it by a mapped network drive letter).