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Product, version and build: PowerShell Studio 2010, 5.7.178
32 or 64 bit version of product: 64 bit
Operating system: Win 10
32 or 64 bit OS: 64 bit

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Output Window Shows the below. The MainForm.psf will not open in the Tabs workspace. I tried to do a save and reopen the project and I get the same results.

MainForm.psf: '', hexadecimal value 0x17, is an invalid character. Line 1572, position 2.
MainForm.psf: Unable to determine object class.
Object reference not set to an instance of an object.
About.psf: This file was created using an older version.
About.psf: On Save, a backup of this file will be created before converting to the latest version.
MainForm.psf: '', hexadecimal value 0x17, is an invalid character. Line 1572, position 2.
MainForm.psf: Unable to determine object class.
Object reference not set to an instance of an object.
MenuForm.psf: This file was created using an older version.
MenuForm.psf: On Save, a backup of this file will be created before converting to the latest version.
About.psf: This file was created using an older version.
About.psf: On Save, a backup of this file will be created before converting to the latest version.
About.psf: This file was created using an older version.
About.psf: On Save, a backup of this file will be created before converting to the latest version.
MainForm.psf: This file was created using an older version.
MainForm.psf: On Save, a backup of this file will be created before converting to the latest version.
MainForm.psf: '', hexadecimal value 0x17, is an invalid character. Line 1572, position 2.
MainForm.psf: Unable to determine object class.
Object reference not set to an instance of an object.
MainForm.psf: '', hexadecimal value 0x17, is an invalid character. Line 1572, position 2.
MainForm.psf: Unable to determine object class.
Object reference not set to an instance of an object.
MainForm.psf: '', hexadecimal value 0x17, is an invalid character. Line 1572, position 2.
MainForm.psf: Unable to determine object class.
Object reference not set to an instance of an object.
About.psf: This file was created using an older version.
About.psf: On Save, a backup of this file will be created before converting to the latest version.
MainForm.psf: '', hexadecimal value 0x17, is an invalid character. Line 1572, position 2.
MainForm.psf: Unable to determine object class.
Object reference not set to an instance of an object.
MainForm.psf: '', hexadecimal value 0x17, is an invalid character. Line 1572, position 2.
MainForm.psf: Unable to determine object class.
Object reference not set to an instance of an object.
Credentials.psf: This file was created using an older version.
Credentials.psf: On Save, a backup of this file will be created before converting to the latest version.

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Please answer the following questions:
- What was the previous version of PowerShell Studio you had installed?
- What is the file encoding of MainForm.psf?
- If you are able to, can you please upload your project or just MainForm.psf here so we can better assist you:
https://www.sapien.com/support/upload

It appears there was corruption at the end of the file at the time of conversion. Found the backup and notice the following character Ěnø The paste changed what I am seeing. The backup file ends with </File>. I replaced the text. But now when I try to run it it gives me the following error
Length cannot be less than zero.
Parameter name: length

Does not give me a line number to look at. I have attach the Main.psf file. I was going to attach the backup but does not allow me.

Thanks

I have not been able to reproduce this behavior on another file. I did replace the weird hexadecimal value on line 1572 with </File> and I was able to open the file with PowerShell Studio as you stated:

I did the same if you saw in my post but after that yes I was able to open it. But when I run it gives me the following error
Length cannot be less than zero.
Parameter name: length

Does not give me a line number to look at. I do not have any reference to a length parameter in th code that I could find.

Is this a error in the output panel or an error message popping up? If its an error in the output panel, it has to do with your code. I would recommend adding checks for null.