Python external libraries and when any external methods are called, TC falls into infinite loop

hey, i took your code and then ran it, it seems to work on my end when i run the testexcel() function.

from os import sys
sys.path.insert(0, 'C:\\Users\\justin.kim\\AppData\\Local\\Programs\\Python\\Python36\\Lib\\site-packages')
import openpyxl

def ExcelReadSingleCell(Sheet,Cell):
  excelPath = "C:\\Users\\justin.kim\\Desktop\\test.xlsx"
  wb = openpyxl.load_workbook(excelPath )
  ws = wb.get_sheet_by_name(Sheet)
  mycell=ws[Cell]
  return str(mycell.value)

  
  
  
def testExcel():
  Log.Message(ExcelReadSingleCell("Sheet1", "D3"))
  Log.Message(ExcelReadSingleCell("Sheet1", "D4"))
  Log.Message(ExcelReadSingleCell("Sheet1", "D5"))
  Log.Message(ExcelReadSingleCell("Sheet1", "C3"))
  Log.Message(ExcelReadSingleCell("Sheet1", "C5"))

I'd suggest filing for a support ticket, and the support engineers will guide you through using probably the report generator utility to take a look at your system and see if they can identify what the problem is with TestComplete when you are running your system. With that said, I have personally experience some problems too when using external libraries, like random closing of testcomplete. So to achieve this goal right now, I'd suggest looking into using the Sys.OleObject["Excel.Application"] object to interact with your spreadsheets.