Read Only Status of files???

I am having trouble with Solidworks stating that the filesare read only. I am opening the files across a network. If I tryand open up the file through solidworks it opens ok sometimes.Sometimes I have noticed that the files are shown as read only inthe header bar at the top of the screen. When I open a drawing andthen click on one of the views to open the file it will tell methat the file that I am trying to open is read only or inuse bysome one else.
Also if I open a drawing and then try and save it it will want tosave the associated part or assembly and then I get the read onlyerror there as well.

Or if I open an assembly and then try and open one of the partsthat is in the assembly it will tell me that the part already open.

I don't know what happend as this just started to happen.

Any suggestions???

ToddSolidworksGeneral