Hi McNeel
It seems that I (and maybe the rest of you too?) have a weird SrfSeam bug. If I make a simple pipe around a curve/line/poly-curve/poly-line it sometimes lets me perform SrfSeam only once. Any subsequent attempt at moving the seam results in absolutely nothing; no error and no new seam position. File attached. Can you tell me why the seam can’t be moved or if I’m doing something stupid? 
SrfSeam bug.3dm (5.2 MB)
Sysinfo below 
TIA, Jakob
SysInfo
Rhino 7 SR22 2022-8-16 (Rhino 7, 7.22.22228.22371, Git hash:master @ e90f5e0ced9ec25c2b09918ff2afac27aaada1e4)
License type: Commercial, build 2022-08-16
License details: Cloud Zoo
Windows 10 (10.0.19044 SR0.0) or greater (Physical RAM: 95Gb)
Computer platform: DESKTOP
Standard graphics configuration.
Primary display and OpenGL: NVIDIA Quadro RTX 4000 (NVidia) Memory: 8GB, Driver date: 7-21-2022 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 516.94
> Accelerated graphics device with 4 adapter port(s)
- Windows Main Display attached to adapter port #0
- Secondary monitor attached to adapter port #1
OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)
Anti-alias mode: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High
Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 7-21-2022
Driver Version: 31.0.15.1694
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 8 GB
Rhino plugins that do not ship with Rhino
C:\ProgramData\McNeel\Rhinoceros\7.0\Plug-ins\Twinmotion Direct Link 2020.2 (e24ee14a-9514-47da-8fe6-f6e61b20160e)\Twinmotion Direct Link 2020.rhp “Twinmotion Direct Link 2020” 1.0.6.0
C:\Program Files\Rhino 7\Plug-ins\Tibidabo\VisualARQ.rhp “VisualARQ”
D:\Dropbox\2D & 3D\Rhino plugins\ScaleOverlay.rhp “ScaleOverlay” 1.0.0.0
C:\Program Files\SimLab\Plugins\SimLab VR from Rhino\SimLabVRPlugin.rhp “SimLab VR for Rhino”
D:\Dropbox\2D & 3D\GH\elefront421\ElefrontProperties.rhp “ElefrontProperties” 1.0.0.0
C:\Program Files\Rhino 7\Plug-ins\Tibidabo\Tibidabo.rhp “Tibidabo”
D:\Dropbox\2D & 3D\Rhino plugins\StereoView.rhp “StereoView”
C:\Users\jn\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\RPC\0.0.13\RPC.rhp “RPC”
C:\Users\jn\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\IntelDenoiser\0.6.4\IntelDenoiser.Windows.rhp “IntelDenoiser.Windows” 0.6.4.0
C:\Users\jn\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\NVIDIADenoiser\0.4.3\NVIDIADenoiser.Windows.rhp “NVIDIADenoiser.Windows” 0.4.3.0
C:\Users\jn\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\SubstanceImporter\2.0.2\Substance.Win.rhp “SubstanceImporter” 2.0.2.0
Rhino plugins that ship with Rhino
C:\Program Files\Rhino 7\Plug-ins\SolidTools.rhp “SolidTools”
C:\Program Files\Rhino 7\Plug-ins\Commands.rhp “Commands” 7.22.22228.22371
C:\Program Files\Rhino 7\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 7\Plug-ins\RhinoScript.rhp “RhinoScript”
C:\Program Files\Rhino 7\Plug-ins\AnimationTools.rhp “AnimationTools”
C:\Program Files\Rhino 7\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 7.22.22228.22371
C:\Program Files\Rhino 7\Plug-ins\RhinoRender.rhp “Legacy Rhino Render”
C:\Program Files\Rhino 7\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 7.22.22228.22371
C:\Program Files\Rhino 7\Plug-ins\rdk_ui.rhp “Renderer Development Kit UI”
C:\Program Files\Rhino 7\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 7\Plug-ins\IronPython\RhinoDLR_Python.rhp “IronPython” 7.22.22228.22371
C:\Program Files\Rhino 7\Plug-ins\RhinoCycles.rhp “RhinoCycles” 7.22.22228.22371
C:\Program Files\Rhino 7\Plug-ins\Grasshopper\GrasshopperPlugin.rhp “Grasshopper” 7.22.22228.22371
C:\Program Files\Rhino 7\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 7.22.22228.22371
C:\Program Files\Rhino 7\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 7\Plug-ins\Displacement.rhp “Displacement”
C:\Users\jn\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\PanelingTools\2021.3.2.446\PanelingTools.rhp “PanelingTools”