Error Message with Iridient Transformer: with WriteAccessDo What's this???

It could be that version 1.6.1 fixes this bug.  Or it could be that you're just lucky and the plugin hasn't tried since to modify the catalog at the same time as some other LR task, in which case, the error could reappear in the future. (That's not uncommon with this programming bug, which is fairly common among plugins.)

"In LR Plug-in Manager I don't get an option to remove this plug-in. "Remove" is grayed out."

Clicking Disable in the Status panel of the plugin in Plug-in Manager will prevent the plugin from running. There's no need to remove it (it consumes a tiny amount of disk space).

Remove is greyed out because the plugin is installed in a magic location.  To find that location, do Preferences > Presets > Show All Other Lightroom Presets, which will open Finder / File Explorer on LR's presets and settings folder.  Go to the Modules subfolder and remove the Iridient plugin from there.  Restart LR.

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"LrCatalog:withWriteAccessDo: could not execute action 'Process with Iridient X-Transformer'. It was blocked by another write access call, and no timeout parameters were provided."

This error message arises from a programming error in the plugin.  The plugin is trying to modify the catalog while another LR task is doing the same, but the plugin isn't providing "timeout parameters" that would allow it to wait until that other LR task finishes. The fix is trivial to implement -- tell Iridient Support to tell their engineers to email me via the address on any of my plugin Web pages.

Seen a similar error, but cannot remember where/what.

Two things

1. New copy of Iridient X-Transformer available, v 1.6.1

2. Curious, why go from LRC to X-Transformer. In my workflow, In LRC I import my RAF, accomplish any metadata edits I want, then I close LRC, and run X-Transformer to convert those RAF files to DNG (I find X-Transformer to be a resource hog, so, I run it with nothing else running), then bring LRC back up and accomplish an import (ADD).