# Monitor Center Psychopy v1.84.0rc5

**URL:** <https://discourse.psychopy.org/t/monitor-center-psychopy-v1-84-0rc5/877>\
**Category:** Development\
**Created:** [August 15, 2016, 2:29am UTC](https://discourse.psychopy.org/t/monitor-center-psychopy-v1-84-0rc5/877 "2016-08-15T02:29:24Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Fahed](https://avatars.discourse-cdn.com/v4/letter/f/97f17d/32.png) [@Fahed](https://discourse.psychopy.org/u/Fahed)\
**Post date:** [August 15, 2016, 2:29am UTC](https://discourse.psychopy.org/t/monitor-center-psychopy-v1-84-0rc5/877/1 "2016-08-15T02:29:24Z")

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There seems to be a bug in Monitor Center for this version of Psychopy on Mac OSX, whereby the vertical screen resolution is automatically replaced with the horizontal screen resolution. I.e. if I input 2560 x 1600, it takes 2560 x 2560.

Am I the only one experiencing this bug?

Thanks.

P.S. it may actually be v1.83.04 on the website, but v1.84.0rc5 is what is listed under help\>about

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**Author:** ![Michael](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/michael/32/16_2.png) [@Michael](https://discourse.psychopy.org/u/Michael)\
**Post date:** [August 15, 2016, 2:48am UTC](https://discourse.psychopy.org/t/monitor-center-psychopy-v1-84-0rc5/877/2 "2016-08-15T02:48:31Z")

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I see that too. But I think it might just be displaying the horizontal resolution twice. i.e. setting a value for the vertical resolution does work, it just isn’t displayed properly.

i.e. setting the dimensions in v1.84.0rc5 and then opening monitor centre in v 1.83.04 standalone shows the horizontal and vertical values as they were entered. So v1.84.0rc5 appears to set the vertical value correctly but just can’t display it.

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**Author:** ![Fahed](https://avatars.discourse-cdn.com/v4/letter/f/97f17d/32.png) [@Fahed](https://discourse.psychopy.org/u/Fahed)\
**Post date:** [August 15, 2016, 3:22am UTC](https://discourse.psychopy.org/t/monitor-center-psychopy-v1-84-0rc5/877/3 "2016-08-15T03:22:14Z")

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Are you sure? I get this error when I run my code:

ValueError: Monitor Mac Book Pro 2016 has no known size in pixels (SEE MONITOR CENTER)

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**Author:** ![Michael](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/michael/32/16_2.png) [@Michael](https://discourse.psychopy.org/u/Michael)\
**Post date:** [August 15, 2016, 4:12am UTC](https://discourse.psychopy.org/t/monitor-center-psychopy-v1-84-0rc5/877/4 "2016-08-15T04:12:00Z")

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Hi Fahed. I think I found the issue with Monitor Centre not displaying the vertical pixel value correctly and have proposed a fix for that here: [https://github.com/psychopy/psychopy/pull/1219](https://github.com/psychopy/psychopy/pull/1219)

I don’t see the ValueError problem you reported above though. Perhaps because of the display bug, you’ve inadvertently ended up setting a null value for the vertical field. Try editing the `psychopy/monitors/MonitorCenter.py` file at about line 588 so it read like this:

```
self.ctrlScrPixVert.SetValue(locale.str(_sizePix[1]))

```

Hopefully you’ll then be able to see the actual vertical value correctly. If you are then able to set it, hopefully the ValueError will disappear.

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**Author:** ![Fahed](https://avatars.discourse-cdn.com/v4/letter/f/97f17d/32.png) [@Fahed](https://discourse.psychopy.org/u/Fahed)\
**Post date:** [August 15, 2016, 5:25am UTC](https://discourse.psychopy.org/t/monitor-center-psychopy-v1-84-0rc5/877/5 "2016-08-15T05:25:58Z")

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Thanks, that seems to have solved the issue. Ah the typo…

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**Author:** ![jon](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/jon/32/22_2.png) [@jon](https://discourse.psychopy.org/u/jon)\
**Post date:** [August 15, 2016, 1:39pm UTC](https://discourse.psychopy.org/t/monitor-center-psychopy-v1-84-0rc5/877/6 "2016-08-15T13:39:10Z")

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Thanks for spotting that Fahed and for catching it Mike 🙂