As of version 18.104.22.168 I am having problems saving files opened from the network. One of the errors is “Error saving the document %filename%: Access to %path to file% was denied”. Get that twice then get “General Error General input/output error”. This is happening on 2 win7 computers did not have this till updating to 4.1. The users can save to the directory if they save as a different file name. One user can sometimes save if they click save twice or do a save as, this is local network. the other is saving thru the wan an can only save if they do a save as with a new file name
Try removing “Windows explorer extension” from your LibreOffice installation. Many bugs have been reported since version 4.0.5 related to opening and saving to network shares from Windows clients because of this.