Thanks Richard and Art,

I found the Automatic Context Saving info in the data sheet after refining the search criteria, that's a lesson learned first up.

The MeLabs website mentions paid upgrades but I don't see anything for free even if a licenced owner (I am) - I've emailed Charles Leo for clarification but he's overworked so not expecting a reply soon.

Art, there's some confusion with your last paragraph - I'm not loading an 18F hex file into a 16F part, both are different programs with different resulting hex files except the 18F programs the chip without any problems and runs on a breadboard faultlessly. The 16F programs but suffers those verification checks. As mentioned, the only changes are those concerning the DTInt's files differences between the two families.

I'm looking into upgrading MPASM to see if it changes things - what should I be looking for? The only reference I have to go by is I see on my laptop \PBP3\MPLAB\MPLAB Tools v8.85.msi that I can't remember installing... I'm assuming the MPASM v5.45 I see at the top of the compile box came from the msi install - or am I wrong? Is it MPLAB X I need to download and install or am I completely missing the plot here?

On another tack, if I buy an upgrade does it include the appropriate version of MPASM? If not, how does one ever know when or what version of MPASM is needed? Confusion reigns.

Thanks and regards,
Bill