When I save a modified Excel file to BoxCryptor then the operation fails without notification. If the file already exists a message ususally appears to specify the operation in question (e.g. overwrite). In the recent time no such message bix appears and the file is not stored in BoxCrytor. I've to perform the operation a second time and then it succeeds.
I also habe noticed when stepping through the directory hierarchy that the folder names displayed do not correspond to the folder selected. Which means if there are 2 folders A and B, then if B is selected, then the content of A is display. I assume, that there is a refreshing problem in the background, because if the selection is aborted and done once more the selection corresponds to the folders content.
I'm running the very last version of BoxCryptor on my iPad and elements are sorted by time.