Change SSIS package location (REPOST from SO)
Can you point the 'full path' to the UNC path i.e. \\&lt;servername&gt;\&lt;sharename&gt;\&lt;directoryname&gt;\&lt;packagename&gt; instead and see if that works?

Just like when you map the "X" drive to \\&lt;servername&gt;\&lt;sharename&gt; just use that in the full path of one of your packages and run to see if it'll work. 

If one of your jobs work like that (assuming most all are setup the same and this way, etc), you can probably script out the SQL Agent jobs through SSMS by pressing F7 (once SQL Agent jobs is highlighted), selecting them all from the right pane window, right click, then create to new query window, then do a mass CTRL+H and do a find and replace to replace X:\ with \\&lt;servername&gt;\&lt;sharename&gt;, and then run that.

Just be sure the SSIS proxy account or the SQL Server Agent account has appropriate NTFS and SHARE permissions where the SSIS packages reside to read them.