Typo crept into line 14 of your hooks.php:
additional => additonal

The above change occurred when going from import_paypal-2.3.10-2.pkg to import_paypal-2.3.10-3.pkg whilst remaining in the core v1.1 with no other changes between these versions. Practically all extensions have been affected by this change probably introduced when compiling the pkgs.

Since an unrelated file got edited, you may want to see if the relevantly changed files have issues.

Key changes seen in your v1.2 as opposed to the v1.1 available in theFARepo as import_paypal-2.3.10-2.pkg (haven't see the import_paypal-2.3.10-3.pkg yet) is the removal of the paypal_fee_act field - any reason for commenting them all out? Also the log messages pertaining to memory have been commented out as well.

Line 71 of import_paypal_update.php still refers to the variable $paypal_fee_act as global and probably not used now.

The main purpose of this version was to fix only the filename format alone.

It may be possible that you edited an older set of files.

Do you have it on github?

Even the domain default page http://www.kwikpay.co.nz/ is inaccessible too.

When running the menu option "Import Paypal Transactions", after selecting a csv file and clicking on the "Import Paypal Transaction" button the screen goes blank and this message is displayed.

Not Acceptable!

An appropriate representation of the requested resource could not be found on this server. This error was generated by Mod_Security

The initial URL  is

http://www.xxxxxxxxxxx.co.uk/frontaccounting/modules/import_paypal/import_paypal.php

when the error message is displayed, it is

http://www.xxxxxxxxxxx.co.uk/frontaccounting/modules/import_paypal/import_paypal_update.php?filename=../../tmp/adminpaypal.csv

If I remove ../.. from the url Mod_Security does not kick in.

My host will not turn off mod sec or allow the rules to be varied.

Are there any plans to replace the dot-slash coding?

Cheers

Geoffrey