| Problem | Likely Cause | Solution | |---------|--------------|----------| | Software crashes on calculate | Corrupt form cache | Delete C:\ProgramData\WinTax4\Cache\*.* and restart | | State e-file rejected “SOF” error | Missing signature on Form 8879 | Re-obtain client PIN and mark “Signed” in state module | | Forms missing from list | Uninstalled form pack | Run Updates > Download All Forms (requires internet) | | Slow client switching | Database index outdated | Tools > Database > Rebuild Indexes | | Printing shows gibberish | Outdated printer driver | Update driver or use “Print as Image” option |
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