Thunderbird 17.x drive issues

Desc: TB starts and runs normally, but is not able to connect to any IMAP mail. it is not able to send mail via SMTP nor download the mail from IMAP server (including already recieved mails from inbox)

It does work when the drive letter is E: but does not when G:

I have encountered following issue with ThunderbirdPortable 17.x versions

When running on various system where external medium (onto which TB portable is installed) has different letter assigned, TB does only work on one drive letter assigned (E:).

TB starts and runs normally, but is not able to connect to any IMAP mail. it is not able to send mail via SMTP nor download the mail (including already recieved mails from inbox) from IMAP server

where Ou travel between two systems on first the external disk is letter E: on the second it is letter G: TB portbale work only machine with E: but no on other machine with G:

The TB has been shut down and started correctly, it does not crash or misbahev in other way.

It is not problem one machine only, when I change the drive letter assignment on previously "defunct" machine, TB portable start working normally (well its magic).
Whenever I set the drive letter to E: the TB portable does work, whenever it is set to different letter TB portable does not work.

Strange behaviour due to fact in version s prior to 17.x I did not encountered this problem.

Could this bug be fixxed please. Thanks McF.