Created Unassigned: PAL processing stops with error Invoke-Expression : The variable '$iMemPoolMax' cannot be retrieved because it has not been set [25344]

Whilst attempting to analyse all counters, the error message at the bottom occurred and the PAL analysis stopped. This has happened every time with different .blg files since I upgraded to PAL Wizard v2.3.6. Running on Windows 7 PC. Should I go back to my old PAL version? :-

[Started] Processor % Interrupt Time
Counter data for "_Total"...Done
Counter data for "0"...Done
Counter data for "1"...Done
Counter data for "10"...Done
Counter data for "11"...Done
Counter data for "12"...Done
Counter data for "13"...Done
Counter data for "14"...Done
Counter data for "15"...Done
Counter data for "2"...Done
Counter data for "3"...Done
Counter data for "4"...Done
Counter data for "5"...Done
Counter data for "6"...Done
Counter data for "7"...Done
Counter data for "8"...Done
Counter data for "9"...Done
Generating Charts..Done
Processing Thresholds..Done

[Started] PhysicalDisk Read Latency Analysis
Counter data for "0 C: D:"...Done
Generating Charts..Done
Processing Thresholds..Done

[Started] PhysicalDisk Write Latency Analysis
Counter data for "0 C: D:"...Done
Generating Charts..Done
Processing Thresholds..Done

[Started] LogicalDisk Avg. Disk sec/Read
[Done - Missing counters in log]

[Started] LogicalDisk Avg. Disk sec/Write
[Done - Missing counters in log]

[Started] LogicalDisk % Idle Time
[Done - Missing counters in log]

[Started] Memory Free System Page Table Entries
Counter data for ""...Done
Generating Charts..Done
Processing Thresholds..Done

[Started] Memory Pool Non-Paged Bytes
Counter data for ""...Done
Generating Charts.WARNING: Please post errors or problems with this tool
to the PAL web site
located at http://www.codeplex.com/PAL with the following error message and a
brief description of what you were trying to do. Thank you.
Invoke-Expression : The variable '$iMemPoolMax' cannot be retrieved because it
has not been set.
At C:\Program Files\PAL\PAL\PAL.ps1:3401 char:22
+ Invoke-Expression <<<< -Command $sCode
+ CategoryInfo : InvalidOperation: (iMemPoolMax:Token) [Invoke-Ex
pression], RuntimeException
+ FullyQualifiedErrorId : VariableIsUndefined,Microsoft.PowerShell.Command
s.InvokeExpressionCommand


C:\Program Files\PAL\PAL>