This specific Wayfarer crash issue was caused by xadmaster.library allowing "downgrade" of the built-in xadmaster Tar client. The buggy external Tar client 1.10 (SYS:Libs/xad/Tar) would fail to function correctly, leading to Wayfarer ICU code to fail.
While there's a "XADLibInfo" command to list the XAD clients (internal and external), it is unreasonable to expect the users to keep track of the client versions manually. Therefore I've now changed the logic in xadmaster.library going forward: In MorphOS 3.21 onwards, xadmaster.library will refuse to downgrade the clients with older disk based versions. I think this is a reasonable compromise. It will make it much harder to inadvertently compromising the integrity of the MorphOS installation by grabbing bunch of old 68k xadmaster clients, while still allowing expanding the supported compression formats with external clients as before.
TL;DR: With MorphOS 3.20 and prior: You should be careful not to fill SYS:Libs/xad with bunch of random clients, as they can replace the newer built-in clients with old, buggy versions.
