GPIB VISA：viEventHandler错误

更新安捷伦IO套件16（v16.3.17914.4）更新2后，我们的GPIB连接应用程序不响应viEventHandler事件但仅针对某些用户。
应用程序很好，直到最近，可能Windows Update更改了系统DLL。
添加到本地Administrators组的用户没有任何区别。
当触发设备（EXT）到HP4278A时，受影响的用户得到错误-1073807280（十六进制FFFFFFFFBFFF0050），这在VISA错误代码中没有列出。
它似乎认识到第一次触发然后停止。
我们的应用程序似乎没有收到数据。
IO监视器显示：时间：GPIB：0：INSTR Agilent VISA VISA：viEventHandler [0x634dd510]上下文：uint32 259 eventType in：uint32 1073684491 status ref：uint32 -1073807280 userhandle in：uint32 112029376 vi in：unit32 1后跟第一个数据
处理命令* SRE0，* CLS，DATA？
之前调用了viInstallHandler和viEnableEvent处理程序，没有错误。
I / F卡是NI GPIB-488 PCI，我们在覆盖模式下使用Agilent VISA（旧的NI VISA32已删除）ivi.VISA.Interopt.dll日期为2013年10月7日应用程序是用MS VS2010 C＃.NET 3.5编写的



     以下为原文

  Following an update to Agilent IO Suite 16 (v16.3.17914.4) Update 2 our GPIB connected application is not responding to viEventHandler events BUT for only some users.  
Application was fine until recently, possible Windows Update changed a system DLL.
Added users to local Administrators group makes no difference.

When triggering device (EXT) to HP4278A the effected users get Error -1073807280 (hex FFFFFFFFBFFF0050) which is not listed in the VISA Error codes. It seems to recognize first trigger then stops. Our app doesnt seem to receive the data.

IO Monitor shows:

Time: GPIB:0:INSTR Agilent VISA VISA:viEventHandler[0x634dd510]
context in:uint32 259
eventType in:uint32 1073684491
status ref:uint32 -1073807280
userhandle in:uint32 112029376
vi in:unit32 1

followed by the first data handling Commands *SRE0,*CLS,DATA?

viInstallHandler and viEnableEvent handlers were previously called with no error.

I/F card is an NI GPIB-488 PCI, we are using Agilent VISA in overwrite mode (old NI VISA32 removed)  

ivi.VISA.Interopt.dll is dated 07-Oct-2013

Application is written in MS VS2010 C# .NET 3.5