I've just released version 1.09f of my firmware fork on GitHub, which incorporates many fixes from dc42's latest release. Here the complete changelog of this version:
Quote
Enabled warning messages by default and bumped Arduino version to 1.6.5
Fixed many (potential) issues and merged in improvements (thanks dc42)
X+Y delta corrections may be specified using M665 (thanks dc42)
Reduced output buffer size to 16*256 Bytes -> increased unused RAM to 12KB
M122 reports max number of used output buffers
M557 checks probe point index and returns an error message if it's invalid
Updated Z probe position in homeall macro for Ormerod 2
Other minor changes
A firmware binary can be downloaded from
here - the compatible web interface remains Duet Web Control 1.06. Feedback is appreciated as usual!