[GNC] Crash attempting to import transactions from CSV on W10

[A Harvey]

Hi,
I'm getting a crash when I try to import transactions from a CSV and
am hoping someone can help.  Here are the gory details.

OS is Windows 10.
Gnucash version gnucash-4.1-2020-08-01-git-4.1-12-g12ab85fa6+   works fine.
All subsequent versions through ...08-15... show the following behavior:
Upon attempting to import transactions from a CSV, the import assistant
works correctly up to the page where it should show the results of the
import mapping and allow certain fields to be modified.  When I click on
NEXT to get to that page, the application crashes.

I ran a trace with --debug and --extra for both the working and non-working
versions and compared them.  Near the end of the miles of output, the
non-working version trace file contained the following:
.
.
* 16:15:16  INFO <gnc.account> [xaccAccountGetBalanceInCurrency]  baln=0/1
* 16:15:58  INFO <gnc.import> [GncTxImport::update_pre_trans_props] User
warning: Date could not be understood.
Value can't be parsed into a date using the selected date format.
* 16:15:58  INFO <gnc.import> [GncTxImport::update_pre_trans_props] User
warning: Date could not be understood.
Value can't be parsed into a date using the selected date format.
* 16:15:58  INFO <gnc.import> [GncTxImport::update_pre_split_props] User
warning: Deposit could not be understood.
Value doesn't appear to contain a valid number.
* 16:15:58  INFO <gnc.import> [GncTxImport::update_pre_trans_props] User
warning: Date could not be understood.
Value can't be parsed into a date using the selected date format.
* 16:15:58  INFO <gnc.import> [GncTxImport::update_pre_split_props] User
warning: Deposit could not be understood.
Value doesn't appear to contain a valid number.
* 16:15:58  INFO <gnc.import> [GncTxImport::update_pre_trans_props] User
warning: Date could not be understood.
Value can't be parsed into a date using the selected date format.
* 16:15:58  INFO <gnc.import> [GncTxImport::update_pre_split_props] User
warning: Deposit could not be understood.
Value doesn't appear to contain a valid number.
* 16:16:28  INFO <qof.engine> [qof_event_generate_internal] id=6
hi=1345f788 han=66630812 data=00000000
* 16:16:28  INFO <qof.engine> [qof_event_generate_internal] id=4
hi=14016920 han=66674c38 data=00000000
.
.
Any suggestions?

Regards,
-Arthur