I believe the August 4th update included an undocumented modification (or bug) to macro processing. As a result, a simple macro of mine no longer functions as intended:

Code:
/micon "Fat Chocobo" mount
/merror off
/mount "Fat Chocobo"
/mount "Company Chocobo"
Before the update, this would summon Fat Chocobo every time, unless I had my chocobo companion summoned. If companion was summoned, my companion would be mounted while I ignored the on-screen error message.

After the update, this macro now mounts my companion 95% of the time, regardless of companion's summoned state. Fat Chocobo is mounted very rarely, regardless of companion state.

It seems that changes were made to the macro engine's processing of occasional failure. Please fix this or document a workaround. I want one button that mounts Fat Chocobo unless my companion is summoned, and I've had exactly that for the last five weeks.

P.S. An option to remove on-screen macro errors is long overdue.