Same here!
It started after a crash opening a Local Project Folder, when I got this crash message:
Error report information
Type: unhandled rejection
Reason: Error: missing placeholder '{0}' in string substitution Error: missing placeholder '{0}' in string substitution at Function.ip.fTa (https://editor.construct.net/r278/main.js:1008:245) at q8b (https://editor.construct.net/r278/main.js:1027:477) at Function.f.q0 (https://editor.construct.net/r278/main.js:200:274) at window.aic.Idb (https://editor.construct.net/r278/components/misc/startPage2/startPage2.js:9:342) at xib (https://editor.construct.net/r278/components/misc/startPage2/startPage2.js:4:177)
Stack: Error: missing placeholder '{0}' in string substitution at Function.ip.fTa (https://editor.construct.net/r278/main.js:1008:245) at q8b (https://editor.construct.net/r278/main.js:1027:477) at Function.f.q0 (https://editor.construct.net/r278/main.js:200:274) at window.aic.Idb (https://editor.construct.net/r278/components/misc/startPage2/startPage2.js:9:342) at xib (https://editor.construct.net/r278/components/misc/startPage2/startPage2.js:4:177)
Construct 3 version: r278
URL: editor.construct.net/r278
Date: Tue Jan 11 2022 11:55:55 GMT-0500 (Eastern Standard Time)
Uptime: 13.3 s
Platform information
Browser: Chrome
Browser version: 97.0.4692.71
Browser engine: Chromium
Context: browser
Operating system: Mac OS X
Operating system version: 10.15_7
Device type: desktop
Device pixel ratio: 1
Logical CPU cores: 8
Approx. device memory: 8 GB
User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36
C3 release: r278 (beta)
Language setting: en-US
WebGL information
Version string: WebGL 2.0 (OpenGL ES 3.0 Chromium)
Numeric version: 2
Supports NPOT textures: yes
Supports GPU profiling: yes
Supports highp precision: yes
Vendor: Intel Inc.
Renderer: Intel(R) Iris(TM) Plus Graphics OpenGL Engine
Major performance caveat: no
Maximum texture size: 16384
Point size range: 1 to 255.875
Extensions: EXT_color_buffer_float, EXT_disjoint_timer_query_webgl2, EXT_float_blend, EXT_texture_compression_rgtc, EXT_texture_filter_anisotropic, EXT_texture_norm16, OES_texture_float_linear, WEBGL_compressed_texture_s3tc, WEBGL_compressed_texture_s3tc_srgb, WEBGL_debug_renderer_info, WEBGL_debug_shaders, WEBGL_lose_context, WEBGL_multi_draw