Version 2.9.3 of the Processing plugin works fine, I can run the SAGA tools successfully. Updating the Processing plugin to version 2.10.1 results in SAGA disappearing entirely from the toolbox. The path is fixed at:
C:\Users\Me\.qgis2\python\plugins\processing\algs\saga
Has anyone else come across this issue?
I'm using QGIS 2.8.2 on Windows 7 64-bit.