Both Kent Sullivan's and Steven Croucher's I-Paint v1.3 Disk 1 had a CRC error in the file "font.computer", stored in compressed form in the first archive ("fonts & printers"). This implies that the version of ARC used to compress the file originally had a bug and that the "bad" file was present on the master disk.

Kent fixed the problem by re-compressing a copy of the file (from v1.5b) using ARC v2.50 and then comparing the byte streams, replacing any bytes that differed.

Location  Trk Sec Byt Bad Good
========= === === === === ====
$00021093  27  02  04 $22  $02
$00021094  27  02  05 $09  $00
$00021D04  27  15  06 $6D  $8E
$00021D05  27  15  06 $08  $06
$00021D06  27  15  07 $0C  $0A
$00021D1B  27  15  28 $7F  $21
$00021D1C  27  15  29 $14  $00

Location = location within the image, as reported by HxD (start = $00000000).

Trk, Sec, Byt = the track, sector, and byte corresponding to the location within the image (in decimal).

Bad = incorrect value; Good = correct value

** Many thanks to Robin Harbron for his knowledge and assistance! **