I found a problem that might be related to the one described above:
On Windowns 8 I have changed the default Downloads folder to a folder in the BoxCryptor drive. Everything works as expected, e. g. Internet Explorer is using this folder without any problems.
However, Google Chrome is always launching the "Save As" dialog although the download location is correctly specified in Chrome settings and "Ask where to save each file before downloading" is unchecked. The very same folder works fine as a default download location for Chrome when it is not set as the system default download folder. This seems to be independent of folder names used: I tried several folder names including the standard "Downloads", the result is always the same: Chrome does not accept the folder as its default download location when it is in the BoxCryptor drive and also set as the system default download folder.
Not sure if this is a problem of Chrome or BoxCryptor or both... Any ideas?