AU units started failing

Logic has started to fail lots of AU units which were previously fine - anyone have an idea why?

validating Audio Unit MonoPoly by KORG:

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

AU Validation Tool

Version: 1.6.1a1

Copyright 2003-2007, Apple, Inc. All Rights Reserved.

Specify -h (-help) for command options

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

--------------------------------------------------

VALIDATING AUDIO UNIT: 'aumu' - 'KLMP' - 'KORG'

--------------------------------------------------

Manufacturer String: KORG

AudioUnit Name: MonoPoly

Component Version: 1.2.1 (0x10201)

Component's Bundle Version: 1.2.1

* * PASS

--------------------------------------------------

TESTING OPEN TIMES:

COLD:

Time to open AudioUnit: 5.321 ms

WARM:

Time to open AudioUnit: 0.023 ms

FIRST TIME:

Time for initialization: 5282.500 ms

* * PASS

--------------------------------------------------

VERIFYING DEFAULT SCOPE FORMATS:

Input Scope Bus Configuration:

Default Bus Count:0

Output Scope Bus Configuration:

Default Bus Count:1

Default Format: AudioStreamBasicDescription: 2 ch, 44100 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved

* * PASS

--------------------------------------------------

VERIFYING REQUIRED PROPERTIES:

VERIFYING PROPERTY: Sample Rate

PASS

VERIFYING PROPERTY: Stream Format

PASS

VERIFYING PROPERTY: Maximum Frames Per Slice

PASS

VERIFYING PROPERTY: Last Render Error

PASS

VERIFYING PROPERTY: Instrument Count

PASS

* * PASS

--------------------------------------------------

VERIFYING RECOMMENDED PROPERTIES:

VERIFYING PROPERTY: Latency

PASS

ERROR: -2147450878 IN CALL Remove Property Listener

* * FAIL

--------------------------------------------------

AU VALIDATION FAILED: CORRECT THE ERRORS ABOVE.

--------------------------------------------------

validation result: failed validation