A Monitor Program Has Been Found Sandboxie

When you run a program in Sandbox mode, you will see a thick yellow border around the window to let you know you are in a sandboxed environment. Sandboxie comes in both free and paid versions, where the free version lacks some important features, like forced programs, the ability to run multiple sandboxes, etc. The Start.exe file is located in a subfolder of 'C: Program Files' (mostly C: Program Files Sandboxie ). Known file sizes on Windows 10/8/7/XP are 148,624 bytes (15% of all occurrences), 526,272 bytes and 10 more variants. The file is not a Windows core file. The file has a digital signature. The program is not visible. You should typically activate the monitor before any programs are running in any sandbox. Note that the Resource Access Monitor window blocks access to the Sandboxie Control main window, including its menu, so you will have to start sandboxed programs through the Tray Icon Menu. Welcome to Microsoft Community. The Program Groups tab has a list of preset applications, well it has two groups of browsers, which Sandboxie Plus will isolate from the rest of your computer. You may add new groups or new programs to an existing group using the buttons on the right edge of the tab.

This has to be machine specific rather than a Sandboxie problem but I'm hoping shared experience might point to a clue. A monitor program has been found sandboxie using
I have a number of workstations and laptops and Sandboxie performs brilliantly on all - even including the one I've got a problem with, up till yesterday. On that one, anything using the Chromium Engine (Chrome and Iron) have suddenly stopped functioning as normal. I can still run Firefox or IE but any attempt to run Chrome produces multiple instances of the error:
A Monitor Program Has Been Found Sandboxie'SBIE2101 Object name not found: , error OpenProcess (C0000022) access=001FFFFF initialized=1'
no less than 16 times on opening the browser and then another 2 or 3 for every tab I open. The browser is actually working but the constant error reports make it unusable.
As this is not happening on any other machine I know it can't be a Sandboxie or Chrome problem. But even after scrubbing the installations (with Revo advanced) of Chrome, Iron AND Sandboxie, and then reinstalling them, the problem remains.

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If I could find any clue as to what the error message ('SBIE2101 Object name not found: , error OpenProcess (C0000022) access=001FFFFF initialized=1') means, I might be able to troubleshoot it, but as of now, I haven't a clue where to begin.
Obviously the first thought is 'what's changed'. But I haven't allowed a windows Update in the past few days, so it can't be that. I did make a minor modification to my Zonealarm firewall (stopped it locking the hosts file - to prevent its conflict with Spybot Antibeacon) but I repeated that on nearly 20 other machines yesterday and none of them are exhibiting this behaviour, so it's unlikely to be related to that. I did update SRWare Iron to the 64 bit version 2 days ago (partly because the 32 bit version stopped working in SB on the affected laptop), but didn't touch the Chrome installation (and both were working normally for the rest of that day), so it's unlikely to be that. And no other changes (that I'm aware of) have taken place in the last 48 hours.

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