Hey thanks,
I do use homebrew and I ran brew install qrencode, unfortunately before I got to the part in your post about maybe waiting to verify the updated version. No worries though, I can attempt the update under the same failing conditions via my cloned bootable drive instead and let you guys know the results.
So, with the qrencode installed. Upon attempting to launch PandaBank, we get a new problem...
Process: PandaCoin-Qt [636]
Path: /Applications/pandacoin-qt.app/Contents/MacOS/PandaCoin-Qt
Identifier: com.pandacoin.wallet-qt
Version: 3.0.3 (3.0.3)
Code Type: X86-64 (Native)
Parent Process:

[1]
Responsible: PandaCoin-Qt [636]
User ID: 501
Date/Time: 2017-12-13 12:14:03.193 -0700
OS Version: Mac OS X 10.13.2 (17C88)
Report Version: 12
...
Time Awake Since Boot: 36 seconds
System Integrity Protection: enabled
Crashed Thread: 0
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Reason: DYLD, [0x1] Library missing
Application Specific Information:
dyld: launch, loading dependent libraries
Dyld Error Message:
Library not loaded: /usr/local/opt/miniupnpc/lib/libminiupnpc.16.dylib
Referenced from: /Applications/pandacoin-qt.app/Contents/MacOS/PandaCoin-Qt
Reason: image not found
Binary Images:
0x1065df000 - 0x106cf5ffb +com.pandacoin.wallet-qt (3.0.3 - 3.0.3) <6DFBA9DC-BA34-3ADE-AB88-2C4AE2F5780D> /Applications/pandacoin-qt.app/Contents/MacOS/PandaCoin-Qt
0x106f39000 - 0x106f3ffff +libqrencode.4.dylib (0) /usr/local/opt/qrencode/lib/libqrencode.4.dylib
0x10ae41000 - 0x10ae8b98f dyld (519.2.2) <6695F30B-4E88-3C0B-9867-7D738C44A3E6> /usr/lib/dyld
Model: MacBookPro8,3, BootROM MBP81.004D.B00, 4 processors, Intel Core i7, 2.5 GHz, 16 GB, SMC 1.70f6
Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In
Graphics: AMD Radeon HD 6770M, AMD Radeon HD 6770M, PCIe, 1 GB
Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1333 MHz, 0x859B, 0x435438473353313333394D2E433136464544
Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1333 MHz, 0x859B, 0x435438473353313333394D2E433136464544
...