I've noticed that a new firmware was released a couple of months ago.
http://www.tek.com/oscilloscope/mdo3012-software-4I've installed it and all works as always...
v1.24 10/19/2016
New Features:
- CAN FD support added to MDO3AUTO
Enhancements:
- Expanded decode event table from 800 to 4000 maximum entries
Defects Fixed:
- Fix issue with file download in e*Scope
- Fix issue with CAN number of data bytes not being limited to actual
number of supported bytes based on selected Trigger When condition
- Fixed an issue where old waveform data is not cleared after
a Default Setup
- Fixed an issue where histogram on math is reset when stopped
- Fix a case where CAN Missing Ack at end of frame with an end of frame
error will trigger but does not decode or search
- Fix .CSV timestamp resolution for large records
- Fix case where changes to horizontal scale when stopped and using
large records would result in the waveform being cleared on screen
- Fix a case where scope would transition to PreVu when entering zoom
mode after running for a long period of time
- Fix a case where loading setups with screen cursors on may result
in an error reported from processing the setup file
- Fix a case where, in some settings, waveforms would appear in dots only
- Fix an issue with USB bus CRC calculation for a zero length data packet