Technical Support Notes

Article ID:	T22
Date:	4/14/99
Product:	SPEL for Windows 2.0 with Vision Guide (all versions up to and including 2.2.0)
OS:	Windows NT 4.0
Problem:	Vision Guide GUI problems on slower PC's using VGA mode

Symptoms
The following symptoms have been observed on some Pentium machines running at 200 MHz or slower that are being used as secondary development systems with VGA mode.

While selecting and moving objects, search window sizes or positions change.
After selecting an object, it is not repainted, but appears in a black outline.
The object displayed in the property grid is not the same as the object selected.
Internal errors occur stating that an invalid object has been selected.

This problem has not been observed on vision systems shipped from Epson (minimum PC specifications are Pentium II at 266 MHz).

Causes
The above symptoms are caused by timing problems in the mouse handling routines for the vision GUI. The problems start happening after an object is selected by rapidly clicking down on the object and releasing the mouse. The object is not repainted and the system looses track of which object is currently selected. This does not happen every time an object is selected and is usually difficult to repeat.

Remedies
When you select an object and it is not repainted, select it again before selecting any other objects. When selecting objects, hold the mouse down briefly before releasing.

Status
This problem has been fixed in SPEL for Windows 2.0 version 2.2.1.

Technical Support Notes

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